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Battery issues
918 9 2015-8-13
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xgenmods
lvl.2

United States
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Ever since I updated to 1.3 I have been having issues. I flew 6 perfect flights on my new brand new bird before this issue flawlessly. After the update I tried a battery calibration by flying in a 3 foot hover till it was forced to land and then leaving it on till it showed 5%. Upon the next charge I got battery life at 99% and a capacity of 4200. This was exactly the same as it showed directly after the firmware update. I then flew and I had my battery drop to 89% within the first minute. Shortly after I noticed the voltage falling quickly and bouncing around allot. I landed and tried charging the battery again and was recomended to turn the battery on while charging. I was also told that one cell must be under 3.3 volts in order for the calibration to work correctly and that the drain needed to be continuous from 100% all the way to 3.3 volts on one cell without interupting power. So I flew the inspire once again with a full charge all the way down to a forced landing. This brought me to about 8%. Without turning anything off I removed the props and brought it inside. I let it sit till it hit 3.29 (1st cell only) and went to turn it off. Before I got to it it dropped a bit more on cell one (in secounds) to 3.19 and the inspire shut down on its own.  I then allowed the battery to cool for aprox 10 min before chargering it again. I let it fully charge and then turned the battery on and allowed it to full charge again. I am still left with a battery life of 98% on a brand new battery. I do have the correct capacity now however I am having trust issues with this battery and would love to hear if i should send it in to be warrantied.  Also I am now being told that all cells must be 3.3 or below for the calibration to work correctly. I am at a loss here as to what is correct and if that is the case how would I make this happen being the battery shutdown on its own before that can happen. I was also told that the cells should be much better matched than mine are showing in a discharge. I would love some answers.  I am attaching screen shots of my last calibration discharge and the following full charge.


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2015-8-13
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timswimm
DJI team

Hong Kong
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have you ever fully discharge it ? how many flights you had with this battery?
2015-8-13
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xgenmods
lvl.2

United States
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timswimm, I explained all of this information in my post.
2015-8-13
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xgenmods
lvl.2

United States
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As a note before the firmware update my battery life was at 100% as I would expect to see with a new battery. As soon as the firmware was updated is when the drop occured.
2015-8-13
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w1der
Second Officer

Sweden
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"I was also told that one cell must be under 3.3 volts in order for the calibration to work correctly and that the drain needed to be continuous from 100% all the way to 3.3 volts on one cell without interupting power."

Who told you this ... is this coming from DJI?

I never got them to be this specific about it ...

Also ... 98% ... pretty darn close to 100%
I wouldn´t pay to much attention to this ... As long as your total flight time on one charge isn´t dramatically changing I would be happy with that!
The difference 3.19-3.39 ... this gap ... is that happening just as the batteries are draining at the very end ... or does it happen earlier?


2015-8-13
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xgenmods
lvl.2

United States
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It was someone on another forum that appears to be very knowledgeable. This was after trying the 5% method and no change. What are your thoughts on the imbalance on the discharge and fluctuations of the cells during flight?
2015-8-13
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xgenmods
lvl.2

United States
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w1der Posted at 2015-8-13 19:09
"I was also told that one cell must be under 3.3 volts in order for the calibration to work correctl ...

More less at the end.
2015-8-13
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w1der
Second Officer

Sweden
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xgenmods@gmail. Posted at 2015-8-13 19:16
It was someone on another forum that appears to be very knowledgeable. This was after trying the 5%  ...

Yea ... lots of people appears to "know things" but a lot of them is just guessing and "assuming" things ...
As long as we don´t know it´s coming from DJI we don´t know what to listen to really.

As I said ... I wouldn´t worry to much about the "98%" as this is only an assessment of the batteries expected life time. The assessment could be wrong and as long as your flight time isn´t dropping I wouldn´t worry.
  
How ever ... the imbalance ... (I did some edit on my prior post) ...
If I where you I would send that screenshot to DJI and ask them about it.
2015-8-13
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remltr
lvl.4

United States
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I have 4 batteries. When I did the calibration, I waited until one cell reached 3.29 and then shut off the battery. The other cells varied from 3.3 to 3.9. I was showing 0% at 3.5 on the lowest cell as it was discharging.

When I charged them they all showed full mah at 100% and anywhere from 98% to 100% life.

I will fly them all as normal.

I don't think you have an issue that will cause problems.
2015-8-13
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freddiebd
lvl.3
Flight distance : 1891184 ft
Switzerland
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Correct. Blade Strike - (DJI Rep) and Lynh Phan (very knowledgeable guy on multiple forums) both say 3.3v is the key on the latest FW. Screen Shot 2015-08-13 at 4.26.10 p.m..png Screen Shot 2015-08-13 at 4.25.06 p.m..png
2015-8-13
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